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answered 2016-08-14 22:31:50 +0100
Like that
sage: C1=Cone(rays=[[0,1]]) sage: C2=Cone(rays=[[1,0]]) sage: C1.polyhedron()+C2.polyhedron() A 2-dimensional polyhedron in ZZ^2 defined as the convex hull of 1 vertex and 2 rays